Grids of Schwarzschild models (indicated by the black dots) over various M/Ls and black hole masses M_BH. The best-fitting model, derived as the minimum of χ², is indicated by a large red circle. The contours indicate the levels; the thick green contour shows the 3σ level of the two-dimensional distribution. In addition, we added the 3σ limits on the best-fitting black hole masses of the JAM models (gray shaded regions). The dashed blue line indicates the mass of the black hole which has the radius of the SoI of half the resolution of our LGS AO data (inferred from the narrow component of the AO PSF); this is approximately the lowest black hole measurement that we expect to be detectable based on our data.